Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 2nd February 2010, 16:35   #1
johnboywood
Regular poster
 
rover 75 v6 2.5

Join Date: Jan 2010
Location: nottingam
Posts: 32
Thanks: 0
Thanked 0 Times in 0 Posts
Default rover 75 v6 conn heater problem

hi in my v6 con 2.5 the heaters on the drivers side get red hot as normal but on the passenger its cold, its got the climate controll if that make a differance???
johnboywood is offline   Reply With Quote
Old 2nd February 2010, 17:05   #2
payner75t
Gets stuck in
 
Saab 900 convertible,Ford Mondeo zetec tdci

Join Date: Feb 2007
Location: Braintree
Posts: 808
Thanks: 16
Thanked 7 Times in 7 Posts
Default

have this problem with mine.
as mine was going in to have some work done i spoke to the garage about it.
90% of the time the heater matrix has a blockage in it , apprantly which side it affects is totally random.
payner75t is offline   Reply With Quote
Old 2nd February 2010, 17:15   #3
stinkinunrich
Regular poster
 
rover 75 2.5 conni

Join Date: Oct 2008
Location: cradley heath
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
Default

matrix will be blocked, feeds in and out drivers side so will be hot or at least warm on drivers side ,need to remove matrix and flush it out,not hard job just fiddley.
stinkinunrich is offline   Reply With Quote
Old 3rd February 2010, 11:50   #4
johnboywood
Regular poster
 
rover 75 v6 2.5

Join Date: Jan 2010
Location: nottingam
Posts: 32
Thanks: 0
Thanked 0 Times in 0 Posts
Default hi

is there a how to guide on this?? and ill have a pop see how it goes
johnboywood is offline   Reply With Quote
Old 3rd February 2010, 14:25   #5
Cymrudragon
I really should get out more.......
 
MGZTT2.5 V6 190+ SE 2002

Join Date: Oct 2009
Location: Gilfach-goch
Posts: 2,201
Thanks: 0
Thanked 8 Times in 4 Posts
Default

There is a how to , you will have to search for it .

flush top hose first and the rad, then remove the matrix failing to flush first will leave unwanted deposits in the hose's and will end up blocking again.......ps DO NOT use radweld or other products as they block the matrix as well
Cymrudragon is offline   Reply With Quote
Old 3rd February 2010, 14:42   #6
bl52krz
This is my second home
 
bl52krz's Avatar
 
Rover 75 cdt club + Rover 2.5 KV6 Conni SE

Join Date: May 2008
Location: Birmingham
Posts: 11,356
Thanks: 6,587
Thanked 2,262 Times in 1,729 Posts
Default

Quote:
Originally Posted by johnboywood View Post
hi in my v6 con 2.5 the heaters on the drivers side get red hot as normal but on the passenger its cold, its got the climate controll if that make a differance???
could also be that one of the motors, or the operating flaps for directing the air have packed up. i believe there are 3 motors that operate the heater/flaps.
__________________
Great Barr, Birmingham.
bl52krz is offline   Reply With Quote
Old 3rd February 2010, 14:46   #7
kaiser
This is my second home
 
kaiser's Avatar
 
75 Tourer 2.5 Auto, 1.8T, 75V8ZT

Join Date: Jun 2007
Location: Johannesburg ZA
Posts: 6,200
Thanks: 1
Thanked 859 Times in 613 Posts
Default

Quote:
Originally Posted by payner75t View Post
have this problem with mine.
as mine was going in to have some work done i spoke to the garage about it.
90% of the time the heater matrix has a blockage in it , apprantly which side it affects is totally random.
Ahem. Going out on limb here, but I would be surprised if this car has got two heaters. If you have warm air, the heater works. If you have warm air in only one side, you have a problem with the mixing of cold and warm. Stuck flap valve, stuffed electric motor or rad-weld in the head
But what do I know??
kaiser is offline   Reply With Quote
Old 3rd February 2010, 14:59   #8
Cymrudragon
I really should get out more.......
 
MGZTT2.5 V6 190+ SE 2002

Join Date: Oct 2009
Location: Gilfach-goch
Posts: 2,201
Thanks: 0
Thanked 8 Times in 4 Posts
Default

Quote:
Originally Posted by kaiser View Post
Ahem. Going out on limb here, but I would be surprised if this car has got two heaters. If you have warm air, the heater works. If you have warm air in only one side, you have a problem with the mixing of cold and warm. Stuck flap valve, stuffed electric motor or rad-weld in the head
But what do I know??
Sorry to disapoint but the Directional flap motors are eather side of the foot well drivers/pass they can be heard working , by removing the 2 panels on opperating the heaters . some models Do have 2 heaters eg fbh.
there are 2 fans top and bottom the top can be tested by removing the pollen filter and look inside and you can see, as for the othere fan this is accessed through the pass foowell. if you have warm air from one side on a kv6 engine this usealy means a COLD spot in the matrix eather blocked by silt and other deposits , if the hg as gone at any point and addatives have been added, eg radweld to the coolent this can end up blocking as well . look for air lock first, if ok then flush the top matrix hose , then remove matrix and test for cold spot clean out with De-scaler .
Cymrudragon is offline   Reply With Quote
Old 3rd February 2010, 16:01   #9
kaiser
This is my second home
 
kaiser's Avatar
 
75 Tourer 2.5 Auto, 1.8T, 75V8ZT

Join Date: Jun 2007
Location: Johannesburg ZA
Posts: 6,200
Thanks: 1
Thanked 859 Times in 613 Posts
Default

So, see what you have made me do. I actually went and had a look.

Firstly you have the inlet to the heater/cooling unit. One massive flap valve which either re-circulates or uses outside air.
Next comes the evaporator for the AC. After that, two flap valves, one each side, controlling the amount of air passing over the the heater element. This must be the temperature control, varying between all air after the A/C going through or all of it by-passing the heater or any amount in between.

If one side is cold and the other hot, it is likely that one of these flap valves is operational and the other stuck in the position bypassing the heater totally. They are driven by a small electric motor on each side. That would be my first port of call.

As for a local blockage, possible, anything is, but unlikely to be so area specific as to leave water through only one half of the heater thus full heat on one side of the radiator and total blockage on the other.
kaiser is offline   Reply With Quote
Old 3rd February 2010, 16:14   #10
Cymrudragon
I really should get out more.......
 
MGZTT2.5 V6 190+ SE 2002

Join Date: Oct 2009
Location: Gilfach-goch
Posts: 2,201
Thanks: 0
Thanked 8 Times in 4 Posts
Default

anything is possable, but how many have you removed and cleaned?

as i speak from experience on removing/replacing and unblocking,descaling ,and the amount of times this symptoms turn up regulaly on the forum same old posts warm one side cold the other NEARLY allways turn out to be a blockage. usualy after a hg change as i said ....oh and a air lock will show similar symtoms .
Cymrudragon is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 17:27.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd